Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c32280ffbc335e7…

MALICIOUS

PDF

72.9 KB Created: 2021-08-30 01:57:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 00413a6cd6ebc9e3a4e16b58907b5c6e SHA-1: 1d1a2078950307dcc625585b441af764a8ac52a8 SHA-256: 4c32280ffbc335e7e7f915cf5613be8896082203596def301b9dca3c9c11ada8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, indicate a link farm designed to redirect users to malicious content. No scripts were extracted, and the document body was unreadable, but the overall structure and URL analysis strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/gdubf3j4uj1sc567kuo9prgu33/39229645517.pdf In PDF document text
    • https://kibledergisi.net/resimler/files/rejawagaseluseno.pdfIn PDF document text
    • http://cjandjunemillerfarm.com/clients/75830/File/1863760242.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609839967c459---76117440526.pdfIn PDF document text
    • http://yjsyrj.com/userfiles/file/fejabufol.pdfIn PDF document text
    • http://anneadamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/13784087975.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098a725766e1---dilamer.pdfIn PDF document text
    • https://ost-fogging.com/upload/files/pazadiwakebaguzog.pdfIn PDF document text
    • http://sevinctekstil.com/resimler/files/91798412617.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/a934232aeb6605b5faaf0907fe50c7db/85052660300.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160772359b52a3---18223802841.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/f20291f8f614995dc82d9128d2fad356/89235437808.pdfIn PDF document text
    • http://www.kotolantopeni.cz/files/57150749360.pdfIn PDF document text
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/eaf759312b74a26147c32b6199666de7/32973990716.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/murakojuwe.pdfIn PDF document text
    • http://naoshima-tours.com/images/blog//file/nawumaxobafumo.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/g151k3iv5ehrvps1tcq8d2qq5d/diduduni.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021080222544392.pdfIn PDF document text
    • http://nakajima-ya.com/upload/save_image/files/5186537525.pdfIn PDF document text
    • http://nutranghongngoc.com/media/ftp/file/64983524592.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/kaa0qt3ktk755t4521o4k7qf30/saviteludolezer.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4752237003---78403816841.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/3ca1a3389feb91ad7c52484a5691429e/xijokaniwilek.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160861b5deedd4---16642546026.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=ma%27s+donuts+new+bedfordPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bd2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD2E 15572 bytes
SHA-256: a2fa54302243cb8d29deb749e6d85bf0bbae39448e5536aea4cfa0a73950dd6f
font_01_sfnt_off0000e4df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4DF 10564 bytes
SHA-256: df706754f5bd13ca10e2b97ce7fe3f760d2610abf3a698aa783916dd7def2d52
font_02_sfnt_off0000fd39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1